Studio Technologies MODEL-76B/77B
5.1 Surround Monitoring System for Broadcast, Digital Inputs

MODEL-76B/77B

The StudioComm 76B/77B Surround Monitoring System with digital inputs and analog outputs enables simple and effective monitoring of 5.1 surround and stereo audio material. Comprised of a Model 76B Central Controller and a Model 77B Control Console, this system is especially well suited for broadcast master control and post-production applications with analog-input loudspeakers.

The Model 76B Central Controller is rack mountable and offers two surround (5.1) and three stereo (2-channel) digital inputs that are compatible with AES3id sources. Sample rates of up to 192 kHz and bit depth of up to 24 are directly supported. Exceptional dynamic range and extremely low distortion ensure that the audio quality of each source is maintained.

The Model 76B Central Controller has eight analog balanced line-level outputs organized as:

• Surround (5.1)
• Stereo (2-channel)

The Model 77B Control Console is the "command center." Designed to reside at an operator's location, it allows fingertip selection of all monitoring functions. Numerous LED indicators provide complete status information. Up to six unique input choices are available. Each of the choices can be configured from the system's two surround (5.1) and three stereo (2-channel) inputs. The configuration mode also allows stereo inputs A and B to be used as either stereo or dual monaural sources. This can be especially useful in broadcast applications where a 2-channel AES3id source may carry two independent monaural signals.

A large, easy-to-use rotary digital encoder provides control of the surround monitor output level in precise 0.5-dB steps. A 4-digit numeric display indicates the monitor output or dialnorm level in real time. The monitor output level can be adjusted via the rotary level control, the reference level function, or by way of the dialnorm information included in Dolby E metadata (refer to "Dialnorm Support").

Features:

• Digital audio inputs
• Analog audio outputs
• Flexible input source selection
• Downmix
• Dolby® E dialnorm support
• Level adjustment, reference level, and dim
• Auxiliary monitor output (2-channel)

Specifications:

Model 76B Central Controller

• General Audio:
  Frequency Response: 20 Hz to 40 kHz ±0.05 dB (192 kHz sample rate)
  Distortion (THD+N): 0.004%, ref 1 kHz, +4 dBu output
  S/N Ratio: 86 dB, ref +4 dBu output
  Dynamic Range: greater than 106 dB
  Crosstalk: 104 dB @ 1 kHz; 90 dB @ 20 kHz, ref –1 dBFS input
• Digital Audio Inputs: five (18 audio channels)
  Configuration: two surround (5.1) and three stereo (2-channel)
  Type: AES3id/SMPTE 276M (75 ohms, unbalanced)
  Connectors: BNC
  Supported Sample Rates: 32, 44.1, 48, 88.2, 96, 176.4, and 192 kHz
  Word Length: 24 bits maximum
  Sync Source: all inputs independently self-clocking
• Analog Monitor Outputs: eight
  Configuration: organized as one surround (5.1) and one auxiliary stereo (2-channel)
  Type: electronically balanced
  Maximum Level: +26 dBu into 600 ohms or greater
  Connector: 25-pin D-subminiature female
• Downmix: 5.1 to stereo, stereo to mono
• Dolby E Metadata Input:
  Type: RS-485/RS-422
  Connector: 9-pin D-subminiature female
  Data Rate/Format: 115.2 kbit/s, 8-N-1
• Control Console Interface:
  Type: RS-485, 115.2 kbit/s, 8-N-1
  Connector: 9-pin D-subminiature female
  Power: 12 volts DC, 200 milliamperes maximum
• Remote Control Inputs: three
  Functions: remote mute all, remote dim, auxiliary output on/off
• AC Mains:
  Requirement: 100, 120, or 220/240 V, ±10%, factory configured, 50/60 Hz, 30 watts maximum
  Connector: 3-blade, IEC 320 C14-compatible (mates with IEC 320 C13)
• Dimensions (Overall):
  19.00 inches wide (48.3 cm)
  1.72 inches high (4.4 cm)
  7 inches deep (17.8 cm)
• Mounting: one space in a standard 19-inch rack
• Weight: 6.2 pounds (2.8 kg)

Model 77B Control Console

• Application: up to four Model 77B Control Consoles can be connected to a Model 76B Central Controller
• Power: 12 volts DC, maximum current 100 milliamperes, provided by Model 76B Central Controller
• Control Data:
  Type: RS-485
  Data Rate/ Format: 115.2 kbit/s, 8-N-1
  Connector: 9-pin D-subminiature female
• Dimensions (Overall):
  7.20 inches wide (18.3 cm)
  2.20 inches high (5.6 cm)
  5.40 inches deep (13.7 cm)
• Weight: 1.7 pounds (0.8 kg)

Our Part #  MODEL-76B/77B